/Engine/Source/Editor/UnrealEd/Public/SourceCodeNavigation.h
Finds the base directory for a given module. Does not rely on symbols; finds matching .build.cs files.
static bool FindModulePath ( const [UPackage](API\Runtime\CoreUObject\UObject\UPackage) * InModulePackage, [FString](API\Runtime\Core\Containers\FString) & OutModulePath )